Resource exhaustion in Spring Security
CVE-2026-40988
An application using spring-security-saml2-service-provider and the REDIRECT binding for SAML 2.0 Login or Logout may be vulnerable to a denial of service by way of an unbounded writer that inflates the compressed SAML payload into memory. Affected versions: Spring Security 5.7.0 through 5.7.23; 5.8.0 through 5.8.25; 6.3.0 through 6.3.16; 6.4.0 through 6.4.16; 6.5.0 through 6.5.10; 7.0.0 through 7.0.5.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (37.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.001
Affected products
- Spring Security — versions 5.7.0, 5.8.0, 6.3.0
- VMware Spring Security
Weakness classification (CWE)
References
- spring.io/security/cve-2026-40988 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-40988?
- CVE-2026-40988 is a high-severity vulnerability in Spring Security, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-06-10.
- How severe is CVE-2026-40988?
- High severity. CVSS v3 base score is 7.5 out of 10.